（1）
（2）-16
（3）-49
（4）-19
(1) 原式
····································································· 1分
································································ 2分
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·················································································· 6分
(2) 原式
························································· 1分
······························································ 4分
·········································································· 5分
················································································ 6分
(3) 原式
·························································· 3分
······································································ 4分
················································································ 6分
(4) 原式
···················································· 2分
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··········································································· 5分
··············································································· 6分